Sperry Marine 4914-CA, Operation, Installation And Service Manual

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The NAVIGAT X MK 1 is a complex electronic system. In case of mal-
function, it would neither be practical nor economical to carry out trou-
bleshooting and servicing in the field down to the level of individual
circuit components.
Unless instructed otherwise by Sperry Marine engineering, field service
personnel should limit troubleshooting to:
• Visual inspection of mechanical components, the master board and
wiring.
• Continuity checks of wiring connections.
• Checks for short circuit/overload conditions or reversed polarities.
These conditions are indicated by red LEDs on the master board.
• Checking for on-board voltages and I/O signals. The presence of
voltages and signals is indicated by green LEDs on the master board.
Exact voltage levels must be checked with a voltmeter. The data con-
tent on serial I/O lines must be checked with the aid of suitable ana-
lyzing tools, such as PC-based protocol interpreters or terminal
programs.
When components on the master board, other than socketed ICs, are
assumed to cause malfunction, the complete master board assembly,
stock no. 20672, is to be exchanged.
When components on the baseplate assembly are assumed to cause
malfunction, the complete baseplate assembly, stock no. 22407, is to be
exchanged.
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Risk of damage of electrostatic-discharge-sensitive components
The NAVIGAT X MK 1 contains electrostatic sensitive components.
Electrostatic discharge may permanently damage components.
When servicing the NAVIGAT X MK 1, take considerable precautions to
prevent electrostatic discharge. Avoid touching any of the electronic cir-
cuitry.